首先要引入两个jar文件 jcommon-1.0.23.jar 然后还有 jfreechart-1.0.19.jar
import java.awt.Font;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
public class BarChartDemo {
/**
* @param args
*/
public static void main(String[] args) {
JFreeChart chart = ChartFactory.createBarChart("统计", "水果", "水果种类",
getDataSet());
// 从这里开始
CategoryPlot plot = chart.getCategoryPlot();// 获取图表区域对象
CategoryAxis domainAxis = plot.getDomainAxis(); // 水平底部列表
domainAxis.setLabelFont(new Font("黑体", Font.BOLD, 14)); // 水平底部标题
domainAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12)); // 垂直标题
ValueAxis rangeAxis = plot.getRangeAxis();// 获取柱状
rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
chart.getTitle().setFont(new Font("宋体", Font.BOLD, 20));// 设置标题字体
ChartPanel chartPanel = new ChartPanel(chart, true); // 这里也可以用chartFrame,可以直接生成一个独立的Frame
JFrame frame=new JFrame("Java数据统计图");
frame.add(chartPanel); //添加柱形图
frame.setBounds(50, 50, 900, 600);
frame.setVisible(true);
}
private static CategoryDataset getDataSet() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, "北京", "苹果");
dataset.addValue(100, "上海", "苹果");
dataset.addValue(100, "广州", "苹果");
dataset.addValue(200, "北京", "梨子");
dataset.addValue(200, "上海", "梨子");
dataset.addValue(200, "广州", "梨子");
dataset.addValue(300, "北京", "葡萄");
dataset.addValue(300, "上海", "葡萄");
dataset.addValue(300, "广州", "葡萄");
dataset.addValue(400, "北京", "香蕉");
dataset.addValue(400, "上海", "香蕉");
dataset.addValue(400, "广州", "香蕉");
dataset.addValue(500, "北京", "荔枝");
dataset.addValue(500, "上海", "荔枝");
dataset.addValue(500, "广州", "荔枝");
return dataset;
}
}